Moin together, given: A fan with 300 watts of power consumption, 12 V voltage, single stage. According to ohms law, should mean that a current of 25 amperes flows through the operation. The part is operated two stage by a pre-resistance with 0.3 ohms. The pre-resistance is already a proper device and operated in the air flow, however, I doubt my computing skills. Which leads me to this: According to URI, the 7.5V voltage takes away. Would mean that within the resistance the 180 watts are converted into heat when 25 amperes flow through. The engine itself would still get 4.5V. Would that be enough to start it? I ask that too, since there is obviously a pre-resistance with 0.8 ohms… It is a car based on the Grande Punto platform, as a pre-resistance there is such a thing installed: https://eurostarter.de/…-original-oem-51805134-for-fiat-82790.html. Does it hold or is it possibly a circuit with the resistance as a voltage divider somehow parallel? The motor without resistance does not start at the small level. Can someone bring light into the dark?